configure: Allow systemd service installation without systemd.pc #309
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If the systemdsystemunitdir got passed anyway as a variable, we don't need the systemd.pc dependency anymore and allow building without a systemd build-dependency.
Relevant in Alpine Linux, where we allowed systemd services to be (sub-)packaged (e.g. for downstreams like postmarketOS), but don't have systemd pacakged in Alpine itself, yet.